These sway bars are made from premium high carbon spring steel that is shot-peened, tempered, and uses heat induction form ends to enhance durability and strength. From the precision fit, zinc-plated pillow brackets with polyurethane bushings that feature an anti-slip and pre-slit shoulder (for easy installation) to the zinc-plated Grade 5 hardware, our sway bars follow the OE manufacturer's spec for original shape ensuring proper clearance. With Scott Drake, there's no question about how it will fit or perform - we are driven beyond perfection. Although these should clear most Big Block oil filters, due to the sway bar's large diameter and slight variances from car to car there may be limited space. A special oil filter (such as Motorcraft FL-400) or spacers may be required.